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/*
lag.c : irssi
Copyright (C) 1999 Timo Sirainen
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "module.h"
#include "signals.h"
#include "misc.h"
#include "settings.h"
#include "irc-servers.h"
#include "servers-redirect.h"
typedef struct {
IRC_SERVER_REC *server;
GTimeVal time;
} LAG_REC;
static gint timeout_tag;
static GSList *lags;
static LAG_REC *lag_find(IRC_SERVER_REC *server)
{
GSList *tmp;
for (tmp = lags; tmp != NULL; tmp = tmp->next) {
LAG_REC *lag = tmp->data;
if (lag->server == server)
return lag;
}
return NULL;
}
static void lag_free(LAG_REC *rec)
{
lags = g_slist_remove(lags, rec);
g_free(rec);
}
static void lag_send(LAG_REC *lag)
{
IRC_SERVER_REC *server;
g_get_current_time(&lag->time);
server = lag->server;
server->lag_sent = server->lag_last_check = time(NULL);
server_redirect_event(server, "ping", NULL, FALSE,
"lag ping error",
"event pong", "lag pong", NULL);
irc_send_cmdv(server, "PING %s", server->real_address);
}
static void lag_get(IRC_SERVER_REC *server)
{
LAG_REC *lag;
g_return_if_fail(server != NULL);
/* nick changes may fail this check, so we should never do this
while there's nick change request waiting for reply in server.. */
lag = g_new0(LAG_REC, 1);
lags = g_slist_append(lags, lag);
lag->server = server;
lag_send(lag);
}
/* we didn't receive PONG for some reason .. try again */
static void lag_ping_error(IRC_SERVER_REC *server)
{
LAG_REC *lag;
lag = lag_find(server);
if (lag != NULL)
lag_send(lag);
}
static void lag_event_pong(IRC_SERVER_REC *server, const char *data,
const char *nick, const char *addr)
{
GTimeVal now;
LAG_REC *lag;
g_return_if_fail(data != NULL);
lag = lag_find(server);
if (lag == NULL) {
/* not expecting lag reply.. */
return;
}
server->lag_sent = 0;
g_get_current_time(&now);
server->lag = (int) get_timeval_diff(&now, &lag->time);
signal_emit("server lag", 1, server);
lag_free(lag);
}
static int sig_check_lag(void)
{
GSList *tmp, *next;
time_t now;
int lag_check_time, max_lag;
lag_check_time = settings_get_int("lag_check_time");
max_lag = settings_get_int("lag_max_before_disconnect");
if (lag_check_time <= 0)
return 1;
now = time(NULL);
for (tmp = servers; tmp != NULL; tmp = next) {
IRC_SERVER_REC *rec = tmp->data;
next = tmp->next;
if (!IS_IRC_SERVER(rec))
continue;
if (rec->lag_sent != 0) {
/* waiting for lag reply */
if (max_lag > 1 && now-rec->lag_sent > max_lag) {
/* too much lag, disconnect */
signal_emit("server lag disconnect", 1, rec);
rec->connection_lost = TRUE;
server_disconnect((SERVER_REC *) rec);
}
} else if (rec->lag_last_check+lag_check_time < now &&
rec->cmdcount == 0 && rec->connected) {
/* no commands in buffer - get the lag */
lag_get(rec);
}
}
return 1;
}
void lag_init(void)
{
settings_add_int("misc", "lag_check_time", 30);
settings_add_int("misc", "lag_max_before_disconnect", 300);
lags = NULL;
timeout_tag = g_timeout_add(1000, (GSourceFunc) sig_check_lag, NULL);
signal_add_first("lag pong", (SIGNAL_FUNC) lag_event_pong);
signal_add("lag ping error", (SIGNAL_FUNC) lag_ping_error);
}
void lag_deinit(void)
{
g_source_remove(timeout_tag);
while (lags != NULL)
lag_free(lags->data);
signal_remove("lag pong", (SIGNAL_FUNC) lag_event_pong);
signal_remove("lag ping error", (SIGNAL_FUNC) lag_ping_error);
}
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